Device for regeneration, temperature loading, and/or thermal management, associated injection valve, and method

Abstract

The invention relates to a device for the regeneration, temperature loading and/or thermal management of a component, assigned to an exhaust system, of an internal combustion engine. The device includes at least one injection valve which injects a fluid, in particular fuel, into the exhaust system, preferably in chatter mode, for example as a function of the pressure of the supplied fluid. The injection valve has a valve head and a valve seat which have geometries designed in such a way that a fluidic force of the supplied fluid acting on the injection valve drops continuously over a stroke of the valve head. The invention also relates to an injection valve having such valve-head and valve-seat geometries and to a corresponding method for the regeneration, temperature loading and/or thermal management of a component, assigned to an exhaust system, of an internal combustion engine.

1. A device for regeneration, temperature loading, and/or thermal management of a component associated with an exhaust system of an internal combustion engine, the device comprising:
 at least one injection valve which injects fluid into the exhaust system in a chattering mode as a function of a pressure of supplied fluid for the regeneration, temperature loading, and/or thermal management of the component, 
 wherein the at least one injection valve has a valve head and a valve seat, and 
 wherein the valve head has a valve head cut edge that expands from an inner head diameter to an outer head diameter with a flattened ball-shaped external curvature, which has a predetermined valve head radius, and the valve seat, between an inner seat diameter and an outer seat diameter, has a straight valve seat cut edge that has a predetermined angle in relation to a vertical, so that a flow force of the supplied fluid acting on the at least one injection valve decreases continuously over a stroke of the valve head to enlarge a pressure range of the chattering mode. 
 
     
     
       2. The device as recited in  claim 1 , wherein the outer head diameter of the valve head is larger than the outer seat diameter of the valve seat, and the valve head juts out over a valve sealing edge of the valve seat in a closed position. 
     
     
       3. The device as recited in  claim 1 , wherein the valve head is recessed relative to an edge region of the at least one injection valve in at least a closed state of the at least one injection valve. 
     
     
       4. The device as recited in  claim 3 , wherein the edge region is connected to the valve seat by an inclined region so that a niche delimited by the inclined region and the valve head is formed between the valve head and the edge region. 
     
     
       5. The device as recited in  claim 2 , wherein the valve sealing edge of the valve seat is situated at the outer seat diameter of the valve seat. 
     
     
       6. The device as recited in  claim 2 , wherein on a side of the outer seat diameter of the valve seat, between the valve seat and an edge region or at the edge region of the valve, an inclined region is provided so that the valve head is able to move inside a niche laterally delimited by the inclined region and is recessed in relation to the edge region in at least a closed state of the valve. 
     
     
       7. The device as recited in  claim 1 , wherein the at least one injection valve is embodied in the form of a spring-loaded valve. 
     
     
       8. The device as recited in  claim 1 , further comprising a safety valve that shuts off fluid supply, and wherein the at least one injection valve is preceded in a fluid line by the safety valve. 
     
     
       9. The device as recited in  claim 1 , further comprising a metering valve that determines fluid quantity, and wherein the at least one injection valve is preceded in a fluid line by the metering valve. 
     
     
       10. The device as recited in  claim 1 , wherein an additional valve that functions as a metering valve is integrated into the at least one injection valve. 
     
     
       11. The device as recited in  claim 10 , wherein the metering valve is situated upstream of the valve head and the valve seat. 
     
     
       12. The device as recited in  claim 11 , wherein the metering valve is connected by a valve holder to a valve body that includes the valve seat. 
     
     
       13. The device as recited in  claim 12 , wherein the valve holder delimits a resonance volume between the metering valve and the valve body. 
     
     
       14. The device as recited in  claim 8 , further comprising a metering valve that determines fluid quantity to the at least one injection valve, and wherein the at least one injection valve is preceded in a fluid line by the metering valve, and the safety valve and the metering valve are situated in a low-pressure circuit of a fuel injection system of the internal combustion engine. 
     
     
       15. The device as recited in  claim 1 , wherein the component is a particulate filter or an NOx reservoir. 
     
     
       16. An injection valve for use in a device for regeneration, temperature loading, and/or thermal management of an exhaust system-associated component of an internal combustion engine, the injection valve injecting a fluid into the exhaust system in a chattering mode as a function of a pressure of supplied fluid, the injection valve comprising a valve head and a valve seat, the valve head having a valve head cut edge that expands from an inner head diameter to an outer head diameter with a flattened ball-shaped external curvature, which has a predetermined valve head radius, and the valve seat, between an inner seat diameter and an outer seat diameter, having a straight valve seat cut edge that has a predetermined angle in relation to a vertical so that a flow force of supplied fluid acting on the injection valve decreases continuously over a stroke of the valve head to enlarge a pressure range of the chattering mode. 
     
     
       17. A method for regeneration, temperature loading, and/or thermal management of an exhaust system-associated component of an internal combustion engine, comprising the steps of:
 providing at least one injection valve which injects fluid into the exhaust system in a chattering mode as a function of a pressure of supplied fluid, and 
 forming the at least one injection valve with a valve head having a valve head cut edge that expands from an inner head diameter to an outer head diameter with a flattened ball-shaped external curvature, which has a predetermined valve head radius and a valve seat, between an inner seat diameter and an outer seat diameter, having a straight valve seat cut edge that has a predetermined angle in relation to a vertical, so that a flow force of the supplied fluid acting on the at least one injection valve decreases continuously over a stroke of the valve head to enlarge a pressure range of the chattering mode. 
 
     
     
       18. The device as recited in  claim 1 , wherein the enlarged pressure range of the chattering mode is from approximately 3.0 bar to 4.8 bar.